Canadian Currency Frequency

Having lived in Detroit for over three years now, I have come to accept that 4 out of 10 times when I get pennies for change, there is some Canadian tender in the mix. But I was thinking, until I moved here, finding a Canadian coin was somewhat rare. Being so close to the country and with daily work commuters crossing the border, it’s not hard to imagine why the Detroit metro area would be filled with some Canadian currency.

I wonder if it’s the same in Texas or New Mexico with Mexican money? Are there any Mexican coins that when glanced at or held could pass as American tender?

Luckily (or unluckily in relation to other factors of life) the Canadain dollar is almost equivalent to the US dollar, so I’m not losing any money on the transactions.